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If you use the pack to charge the Rechargeable Device If you are using the pack to charge your Rechargeable Device, you cannot overcharge it. Your pack will monitor and charge the Rechargeable Device as needed.
If you use the USB Charger to charge the Rechargeable Device Yes, it is possible to overcharge your Rechargeable Device using the USB charger. The light turns red while the Rechargeable Device charges. The light on the USB charger will turn blue when the Rechargeable Device has been fully charged. We do not recommend leaving your Rechargeable Device in the USB charger for longer than 24 hours at a time.